unity 从工具栏拖动生成物体

1using System.Collections;
2using System.Collections.Generic;
3using UnityEngine;
4using UnityEngine.EventSystems;
5using UnityEngine.UI;
6//*****************************************************脚本挂在需要拖动的Button或者Image即可***************************************************************
7public class DragSpawn : MonoBehaviour, IPointerDownHandler
8{
9    //正在拖拽的物体
10    private GameObject _objDragSpawning;
11
12    //是否正在拖拽
13    private bool _isDragSpawning = false;
14    public Image image;
15    // Update is called once per frame
16    void Update () {
17        if (_isDragSpawning)
18        {
19            //刷新位置
20            Ray ray = Camera.main.ScreenPointToRay(Input.mousePosition);
21            RaycastHit hit;
22            LayerMask aa = 1 << 8;
23            if (Physics.Raycast (ray,out hit ,100f,aa))
24            {
25                _objDragSpawning.SetActive(true);
26                _objDragSpawning.transform.position = hit.point;
27                image.enabled = false;
28            }
29            else
30            {
31                image.enabled = true;
32                _objDragSpawning.SetActive(false);
33                image.transform.position = Input.mousePosition;
34            }
35            //_objDragSpawning.transform.position = ray.GetPoint(10);
36
37            //结束拖拽
38            if (Input.GetMouseButtonUp(0))
39            {
40                _isDragSpawning = false;
41                _objDragSpawning = null;
42            }
43        }
44    }
45
46    //按下鼠标时开始生成实体
47    public void OnPointerDown(PointerEventData eventData)
48    {
49        GameObject prefab = Resources.Load<GameObject>("person");
50        if(prefab != null)
51        {
52            _objDragSpawning = Instantiate(prefab);
53            _isDragSpawning = true;
54        }
55            
56    }
57
58}下面附上Demo链接:

链接：https://pan.baidu.com/s/18VhVJqXJzrltIJz\_he-JvQ

提取码：k5kg
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